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A187014 as a simple table

n a(n)
4 0
5 0
6 1
7 2
8 3
9 7
10 22
11 57
12 174
13 554
14 1848
15 6291
16 22052
17 78361
18 282420

[0,0,1,2,3,7,22,57,174,554,1848,6291,22052,78361,
 282420]

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Last modified April 13 01:36 EDT 2021. Contains 342934 sequences. (Running on oeis4.)